Subject: port-amiga/21252: Kernel panics after changing floppy when using 'dd'
To: None <>
From: None <>
List: netbsd-bugs
Date: 04/21/2003 18:55:04
>Number:         21252
>Category:       port-amiga
>Synopsis:       Kernel panics after changing floppy when using 'dd'
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-amiga-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Apr 21 18:56:00 UTC 2003
>Originator:     Håkan Thörngren
>Release:        1.6
NetBSD kraki 1.6 NetBSD 1.6 (KRAKI) #1: Tue Mar 25 10:59:43 CET 2003     acumen@kraki:/usr/src/sys/arch/amiga/compile/KRAKI amiga
I want to copy some old Amiga floppies using dd but run into kernel panics when I change the floppy, it is consistent and happens all the time.
I am also pretty certain that the same problem occurs when there is a read error during copy.

This worked like 5+ years ago on a different NetBSD version (have no idea which).  It handled floppy changes and read errors with no ill effects.

I have recompiled the kernel to get a smaller one.
I am using an A3000 (plain 25MHz), problem occurs both for internal HD drive (with DD floppies) and external DD drive (/dev/fd1a).

1. become root (my local user is not allowed to access /dev/fd0a)
2. Put a floppy into the drive.
3. dd if=/dev/fd0a of=file  (this can be repeated with no ill effects, I did so to make sure it read the floppy OK using diff on the files)
4. When copy done, change to another floppy disk in the drive.
5. dd if=/dev/fd0a of=another_file

Console message:
panic: biodone already
Stopped in pid 199 (dd) at     cpu_Debugger+0x6:     unlk    a6